/*
 * Copyright (c) 2017 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 */
package org.eclipse.ditto.model.policies;

/**
 * Represents a {@link Subject} issuer who has issued the subject.
 */
public interface SubjectIssuer extends CharSequence {

    /**
     * The issuer for authentication subjects provided by google.
     */
    SubjectIssuer GOOGLE = PoliciesModelFactory.newSubjectIssuer("google");

    /**
     * The issuer for authentication subjects provided when integrating with external systems.
     */
    SubjectIssuer INTEGRATION = PoliciesModelFactory.newSubjectIssuer("integration");

    @Override
    String toString();

}
